A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

WA's McGowan takes blame for loss

West Australian Labor leader Mark McGowan refuses to link his election defeat to the federal party yet hopes his diminishing pool of parliamentary colleagues will give him another shot.

"I take responsibility for the outcome and I'm not going to blame anyone else," Mr McGowan said.

He said Saturday had been a brutal night for state Labor, which would spend coming days reflecting on its caning at the polls, but he couldn't yet pinpoint what had gone wrong.

It was always difficult to defeat a first-term government, he said, and wouldn't be drawn on the many comments from both sides of politics - including defence minister Stephen Smith - that the party's federal woes had dented WA Labor's chances.

"I'm not going to blame any other level of government," Mr McGowan said.

"I know over the coming week, people will try to make me do it.

"I'm the leader - I said it was a state campaign, I was repetitive in saying that."